/*
 * Copyright (c) 1987, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Portions copyright (c) 1999, 2000
 * Intel Corporation.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * 
 *    This product includes software developed by the University of
 *    California, Berkeley, Intel Corporation, and its contributors.
 * 
 * 4. Neither the name of University, Intel Corporation, or their respective
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
#endif
static const char rcsid[] =
		"$Id: mktemp.c,v 1.1.1.1 2006/05/30 06:13:52 hhzhou Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>

#include <libc_debug.h>

char *_mktemp __P((char *));

static int _gettemp __P((char *, int *, int));

int
mkstemp(path)
	char *path;
{
	int fd;

	return (_gettemp(path, &fd, 0) ? fd : -1);
}

char *
mkdtemp(path)
	char *path;
{
	return(_gettemp(path, (int *)NULL, 1) ? path : (char *)NULL);
}

char *
_mktemp(path)
	char *path;
{
	return(_gettemp(path, (int *)NULL, 0) ? path : (char *)NULL);
}

#ifdef UNSAFE_WARN
__warn_references(mktemp,
    "warning: mktemp() possibly used unsafely; consider using mkstemp()");
#endif

char *
mktemp(path)
	char *path;
{
	return(_mktemp(path));
}

static int
_gettemp(path, doopen, domkdir)
	char *path;
	register int *doopen;
	int domkdir;
{
	register char *start, *trv;
	struct stat sbuf;
	int pid, rval;

	if (doopen && domkdir) {
		errno = EINVAL;
		return(0);
	}

DPRINT((L"_gettemp: path %a\n", path ));
	for (trv = path; *trv; ++trv)
		;
	--trv;

	while (*trv == 'X') {
		char c;

		pid = (arc4random() & 0xffff) % (26+26);
		if (pid < 26)
			c = pid + 'A';
		else
			c = (pid - 26) + 'a';
		*trv-- = c;
DPRINT((L"_gettemp: via arc: replaced 'X' with %c\n", *(trv+1)));
	}
	start = trv + 1;

	/*
	 * check the target directory; if you have six X's and it
	 * doesn't exist this runs for a *very* long time.
	 */
	if (doopen || domkdir) {
		for (;; --trv) {
			if (trv <= path)
				break;
			if (*trv == '/') {
				*trv = '\0';
				rval = _faststat(path, &sbuf);
				*trv = '/';
				if (rval != 0)
					return(0);
				if (!S_ISDIR(sbuf.st_mode)) {
					errno = ENOTDIR;
					return(0);
				}
				break;
			}
		}
	}

	for (;;) {
		if (doopen) {
			if ((*doopen =
			    open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
				return(1);
			if (errno != EEXIST)
				return(0);
		} else if (domkdir) {
			if (mkdir(path, 0700) == 0)
				return(1);
			if (errno != EEXIST)
				return(0);
		} else if (_fastlstat(path, &sbuf))
			return(errno == ENOENT ? 1 : 0);

		/* tricky little algorithm for backward compatibility */
		for (trv = start;;) {
			if (!*trv)
				return(0);
			if (*trv == 'Z')
				*trv++ = 'a';
			else {
				if (isdigit(*trv))
					*trv = 'a';
				else if (*trv == 'z')	/* inc from z to A */
					*trv = 'A';
				else
					++*trv;
				break;
			}
		}
	}
	/*NOTREACHED*/
}
